Here are some major sources of water:

• Oceans:
  The largest source of water on Earth, covering over 70% of the surface. However, it is saline and requires desalination for most uses.
• Rivers:
  Surface water flowing in a channel to the sea, a lake, or another river. Rivers are a crucial source for human consumption, agriculture, and industry.
• Lakes:
  Large bodies of standing water that can be freshwater or saline.
• Groundwater:
  Water located underground in aquifers, which are permeable rock or soil formations. Groundwater is a significant source for drinking water and irrigation.
  Source: USGS Groundwater Information
• Glaciers and Ice Caps:
  Frozen freshwater stored in glaciers and ice caps. They serve as a long-term reservoir, releasing water during warmer periods.
  Source: National Snow and Ice Data Center - All About Glaciers
• Rainwater:
  Precipitation collected and stored for later use, such as irrigation or drinking water (after treatment).
• Atmosphere:
  While not directly accessible in large quantities, atmospheric water in the form of humidity contributes to precipitation and the water cycle.